- Title
- Estimation of rainfall-runoff model parameters using regionalized flow duration curves
- Creator
- Senz, A. K.; Kuczera, G.
- Relation
- 32nd Hydrology and Water Resources Symposium (H2009). H2009: Proceedings of H2009, the 32nd Hydrology and Water Resources Symposium (Newcastle, N.S.W. 30 November - 3 December, 2009) p. 517-527
- Relation
- http://www.engineersaustralia.org.au
- Publisher
- Engineers Australia / Causal Productions
- Resource Type
- conference paper
- Date
- 2009
- Description
- Conceptual rainfall-runoff models (CRRs) are widely used to simulate catchment runoff. However, assigning values to their parameters at ungauged catchments remains problematic with the prospect of large systematic errors. To counter this there have been many attempts to regionalize CRR parameters using catchment characteristics. However, they typically have low accuracy. One of the reasons for this is that rainfall errors introduce random biases in calibrated CRR parameters, thus confounding any relationship between CRR parameters and catchment characteristics. This study seeks to circumvent this problem by regionalizing flow duration curves (FDCs) and calibrating the CRR model to the regionalized FDC. The potential of the method is explored using the SIMHYD model for a case study based on 55 catchments in eastern NSW. Strong linear (R2>0.80) relationships were found between neighbouring FDC quantiles. In addition, strong relationships were found between catchment characteristics and high-flow FDC quantiles with exceedance probabilities of 0.1 or less. The SIMHYD rainfall-runoff model was calibrated to daily runoff time series and observed and regionalized FDCs. Calibration to the regionalized FDC produced results comparable to calibration to the observed FDC. However, in two out of six cases, the results were poor. This suggests calibration to regionalized FDCs has promise but more work is needed to better understand its performance and understand why it can sometimes fail badly.
- Subject
- rainfall-runoff models; flow duration curves; SIMHYD model; catchments
- Identifier
- http://hdl.handle.net/1959.13/919626
- Identifier
- uon:8931
- Identifier
- ISBN:97808258259461
- Language
- eng
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